from tkinter import *

class App:
    def __init__(self,master):
        frame = Frame(master)
        frame.pack()
        Label(frame, text='def C').grid(row=0,column=0)
        button = Button(frame,text='Convert', command=self.convert)
        button.grid(row = 1)
    def convert(self):
        print('Not implemented')

root = Tk()
# root.wm_title('temp converter')
app = App(root)
root.mainloop()